In some cells, these organelles can be linked together by tubes called stromules, while one of their functions is performed by the namesake molecule i
In some cells, these organelles can be linked together by tubes called stromules, while one of their functions is performed by the namesake molecule in antenna complexes.  They are thought to have arisen from cyanobacteria through endosymbiosis, and they are composed of thylakoids stacked into grana and suspended in stroma.  For 10 points, name these organelles, found only in the cells of plants and some protists, where photosynthesis occurs.
In some cells, these organelles can be linked together by tubes called stromules, while one of their functions is performed by the namesake molecule in antenna complexes.  
{chloroplasts} [accept {plastids} before “{molecule}”]